Differences in Q-jet vs 585 Holley vs 4GC
Anyone ever tried them on the same motor and noted the ET or HP differences?
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Re: Differences in Q-jet vs 585 Holley vs 4GC
I have run the 327 in SS trim that uses 4gc or Q-jet and found the difference is accurately reflected in the HP factors. My motor is low budget.
I spoke to a racer who uses the 327 back and forth between the Holley and Q-jet he claimed Holley was a little quicker . ---Trevor |
Re: Differences in Q-jet vs 585 Holley vs 4GC
Only comparison I have is I test my Q-jet against 850 dbl. pump holley,just out the box carb on my 305 dynoed pretty much same all the way through the pull,holley made 3lbs more tq. @ peak tq..
Then later had a 351C 4bbl head street/strip engine put my q- jet on it and got same results as the 305 identical except about 3lbs. tq. difference @ peak tq. Not really what you asked but maybe help some how. Mike Taylor 3601 |
Re: Differences in Q-jet vs 585 Holley vs 4GC
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It was flow tested and had new Air Bleeds and new parts. It ran a little better than the ones I reworked. Just felt better, crisper, no bogging. Dan |
Re: Differences in Q-jet vs 585 Holley vs 4GC
What is the"585 Holley" and what combination did it come on?
Thanks, Gary Howe, |
Re: Differences in Q-jet vs 585 Holley vs 4GC
585 CFM Holley and I believe it was on 327 in Corvette's for a few years in the 60's. I'm not sure of the exact details because I have never ran this before. Just word of mouth.
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Re: Differences in Q-jet vs 585 Holley vs 4GC
The "585" Holley was on a 1966 Corvette 327/300. Quick Fuel builds a legal replacement #VS585R
I have it on my Super 10 |
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Re: Differences in Q-jet vs 585 Holley vs 4GC
The 585 was used on the Corvette 327/300 66/67 a 585 was also used on the 350hp engine in 65/66 it had jet plates on both ends. The carb we are talking about has 1 9/16" throttle plates. Don't confuse this carburetor with the 66 chevy II and others with 275 hp and a holley it only has 1 1/2" plates.
We use the 67 327/300 comb in the Sunfire my son drives. In our case the holley is better due to the hp factor, but may not work as well in all cases. Ernie Neal SS 354 |
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Re: Differences in Q-jet vs 585 Holley vs 4GC
With my 65 Impala build, I am able to use a 585 Holley on my 396/325 (410 CI now)I do have one to use, just need to find a manifold. I always feel more comfortable with Holleys too, opinions vs Q-Jet. I will probaly try both anyway.
Will Lamprecht I/SA 65 Impala looking to 2016 season. |
Re: Differences in Q-jet vs 585 Holley vs 4GC
Just a thought, maybe better fuel distribution through the manifold with the Holley vs the spread bore Q-Jet even though more CFM with Q-Jet?
Will Lamprecht - |
Re: Differences in Q-jet vs 585 Holley vs 4GC
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Joe Sr. and I raced a 66 Chevy II way back when you had to use the Holley or Carter , and not the Q jet. Still possibly the fastest SS/J car in the country at the end of 1973..Record holder, and No. 1 qualifier at the World Finals in Amarillo...with the 540 Holley. You could use a Q Jet on a 67. This is the reason ,I believe , that Larry Tores built the 67 post car. Anyway, I think we were talking about SS/GT here. Don't you think the small Holley should be rated less than the big one, or the Carter, for that matter? Also nobody has mentioned the little Corvette WCFB yet, on the 520 head combos |
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And let me guess; the car is quicker, but only because you're carrying less weight down the track, with that lighter wallet! |
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http://i303.photobucket.com/albums/n...ps7a6c0c73.jpg |
Re: Differences in Q-jet vs 585 Holley vs 4GC
Holleys are easier to change the boosters on. Just a thought.
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